Implement Warp Ring, Homing Ring and Return Ring
CORE: fixed some SqlHandle logic when loading equipped gear from database
Merge pull request #450 from Cloudef/script/return_homing_ring

Implement Warp Ring, Homing Ring and Return Ring
Add HP and MP multipliers to config.
Make it possible to set drop rates in configuration.
Merge pull request #451 from Cloudef/config_changes

Introduce MP, HP and drop rate multipliers to configuration